Leather manufacture



Patented u 30, 1927.

} UNITED STATES JOHN R. TULLIS, OF NEW -YOBK, N. Y

PATENT OFFICE.

ABSIGNOR, BY MESNE ASSIGNMENTS, '10

GELTAN COMPANY, OF'NEW YORK, N. 'Y., A CORPORATION 01 DELAWARE.

LEATHER MANUFACTURE.

Rom-swing.

' source into the hides in order to improve the ualities of the leather, but attempts to do t is satisfactorily have failed. largely because of the fact that the gelatine would become coated upon the outside surfaces'of the 1 leather without penetrating the interior to the extent desired or to a sufficient degree to give the best results. By the present invention gelatine may be introduced into the leather by means of a carrier, such as a salt which will act in this capacity, after the ordinary tannin operations have been performed and w ile the leather is still in the dam condition. The gelatine may be obtaine from ordinar sources or it may be obtained from the fles and other products that are removed from the hides during the .dehairing and fieshing operations of the raw hides that are to be treated by the process of this invention. The leather that is to have the elatine introduced thereinto may be c rome tanned leather or it may have been tanned by using the ordinary vegetabletanning extracts suc as quebracho, hemlock, chestnut, oak bark, mangrove, spruce, etc., or synthetic tanning materials such as the formaldeh de condensation products, for exam le. The gelatine and salt will preferably first intimately mixed with vegetable tanning extracts and a suflicient amount of tallow and cod liver or similar oil to make a paste, and this composition may then be introduced into the tanned leather while the leather isstill in a damp, condition in an oil wheel .or drum..

Without intending to restrict m If to the particular proportions or ingre 'ents, I will give the following as a specific example illustrative of the invention A mixture may be made consisting ofsapptroximately equal arts of gelatine, a salt suc as sodium chlori 'e, and a vegetable tanningextract- Application a... amen a, 1923. Serial 110. 622,642.

such as ordinary commercial quebracho. About two arts of this mixture may be compounded wlth about one part of tallow and cod liver oil, the tallow and oil'being of about" equal proportions and the whole may be thoroughly mixed toform a paste-like composition. After the hides have been tanned in the-usual or well known manner and while they are still in a damp condition they may be treated from about 20 minutes to 1 hour with the paste or composition in awheel or drum such as is commonly used in this art.

It has been found that when the tanned leather has been treated in the manner above described the gelatine is caused to penetrate the leather instead of merely coating its surface thereby bringing about theresult long sought for, and greatly improving the quality of the leather itself.

I claim:

1. A composition of matter comprising gelatine, asalt and tanning material.

2. A composition of matter comprising gellatine,.a salt, tanning material, tallow and 01 f 3. A comgosition of matter comprising gelatine, Na l and a vegetabletanning extract. so

,4. A composition of matter comprising substantially equal parts of gelatine, NaCl and a vegetable tannin extract, and about half as much tallow an anon-drying oil.

.5. The process which comprises tanning leather and treating it while damp with a composition containlng gelatine and a salt.

6. The process which comprises tanning leather and treatin it while dam with a composition contaimng gelatinean sodium chloride. Y

, 7. The process which comprises tanning leather and treatin it while damp with a, composition containing elatine, a salt, tanning material, tallow an oil.

8. Leather having gel t' e distributed therein. e

9. Leather having, uniformly distributed therethrough. V 111 testimony whereofI aflix my signature.

. f Join: K mus} gelatine substantially I 

